Improvement in sewing-machines



Z-Sheetse-SheetI; T. A. MACAULAY.

SEWING-MACHINE. No. 185,399. Pat-ented Dec.19,1876.

3 11 F fth 2 l W Inventor.

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UNITED STATES PATENT OFFICE.

THOMAS A. MACAULAY, OF NEW YORK, N. Y.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 185,399, dated December 19, 1876; application filed October 13, 1876.

To all whom it may concern:

Be it known that I, THOMAS A. MAOAULAY, of the city, county, and State of New York, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had to the accompanying drawings, forming part of the same.

Similar letters refer to like parts.

The object of my invention is, first, to provide a simple and durable mechanism to operate the shuttle of a sewing-machine; and, second, to provide an efficient and durable device to operate the feed mechanism of a sewing-machine; and consists in the combination and arrangement of parts, as hereinaf ter pointed out in the claims.

In the drawings, Figs. 1 and 5 are vertical cross-sections of the frame of the machine. Figs. 2 and 6 are vertical transverse sections. Fig. 3 is a plan of the shuttle-lever with bed of machine removed. Figs. 4, 7, and 8 are end elevations of equivalent mechanism to Figs. 1 and 5.

Ais the frame of the machine; B, an cecentric on the main shaft G of the machine; 0, a connecting-rod; D, Figs. 1,2, and 8, a radius-bar; D in Figs. 2, 5, 6, and 7, a slot answering the same purpose; D in Fig. 4, a sliding block; E, the shuttle lever; F, the feedshaft; G, the main shaft of the machine; H, a slotted crank on the rear end of the feedshaft; I, the fulcrum-stud of the shuttle-lever. a, in Figs. 1 and 8, is a fulcrum-pin of the radius-bar. D,in Figs. 5 and 7, is a guide-slot, in which the sliding block b moves. b, in Figs. 1 and 8, are pins connecting the radius-bar with the connecting-rod O G. b, in Figs. 5 and 7, a fulcrum-pin on which 0 vibrates. In Fig. 4 12 connects the sliding block D with the connecting-rod G O. 0 c, in Figs. 1, 2, 3, 4, and 7, is a slot or opening in the shuttle-lever E, in which the ball'd of the connecting-rod O 0 works to give a reciprocating movement to the shuttle-lever E. In Figs. 5, 6, and 8 the ball d is on the shuttle-lever E, and the slot 0 c is in the connecting-rod O 0.

Motion being given to the machine by the rotation of the main shaft G carrying the eccentric B, a vertical motion is given to the connecting-rod O O. The connecting-rod G 0 being connected at b to the radius-bar D, or at b or b to its equivalent mechanism above described, receives a lateral movement, which it imparts to the shuttle-lever E by the ball (1 working up and down the slot 0 c of the shuttle-lever E. The extension 6 of the connecting-rod G O, as a result of the vertical and lateral movements of the lever O 0, describes an elliptic circle around the center of the feed-shaft F, and by the connection of the slotted crank 11 to the extension 0 by the pin f a rotary motion is given to the feed-shaft F for operating by any suitable means the feed of the machine.

I have now fully described my invention and the manner of carrying it into effect.

What I claim is 1. In combination with the lever O G, the radius-bar D, or its equivalent, and the shuttle-lever E, the said lever 0 being jointed directly to the shuttle-lever, whereby a reciprocating motion is imparted to the said shuttlelever, substantially as shown and described.

2. In combination with the main shaft G, the feed-shaft F, the shuttle-lever E, the lever 0 O, and the radius-bar D, or its equivalent, the said lever 0 being jointed directly to the shuttle and to the feed-shaft, whereby a rotary motion of the main shaft G imparts an equal and opposite rotary motion to the feedshaft F and a reciprocating motion to the shuttle-lever E, substantially as set set forth.

THOMAS A. MACAULAY.

Witnesses:

HUGH OALLABY, WM. KEYES. 

